Does it support jtag? Ejtag?

Nope. Not much JTAG support in the lower-end Arduino world.

What drivers do I need to install to get this to work?

Install the open source Arduino Development Environment software on your computer. These board are 100% compatible with the standard Arduino UNO R3. You should be able to compile and upload your software to this board with no additional drivers being needed. Silicon Labs does have the USB to UART drivers available on their website just in case you run into an issue with the USB communications. This board worked just fine on my computer, but I already use Silicon Labs USB bridges for my other work. I may already have had their drivers installed so I did not see any issues.

where i can boy motor shield and Led dot matrix 8 * 16 for KS0470 model?

Amazon. Search “Arduino Uno Motor Shield”. Again Amazon and search “MAX7219”.

Keyestudio Uno R3用 V4 0開発ボード | Desertcart UNITED STATES

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Specifications

ASIN	B08H1RB61B
Additional Features	Updated USB Serial Chip for Arduino Compatibility
Aspect Ratio	16:9
Best Sellers Rank	#2,770 in Single Board Computers (Computers & Accessories)
Brand	KEYESTUDIO
Built-In Media	V4.0 board
CPU Model	5X86
CPU Model Number	no
Cache Memory Installed Size	1 GB
Cache Size	1 GB
Color	Yellow
Compatible Devices	Arduino Uno R3 Compatible Devices
Connectivity Technology	USB
Cooling Method	Passive
Customer Reviews	4.5 out of 5 stars 179 Reviews
Display Resolution Maximum	800x600
Display Type	Analog
Graphics Card Description	Dedicated
Graphics Card Interface	Integrated
Graphics Coprocessor	Integrated Graphics
Graphics Description	Dedicated
Hardware Interface	USB
Human-Interface Input	Buttons
Item Weight	0.07 kg
Keyboard Description	NO
Language	English
Manufacturer	keyes
Memory Clock Speed	16 MHz
Memory Speed	16 MHz
Memory Storage Capacity	32 KB
Model Name	KEYESTUDIO V4.0 Development Board
Model Number	KE-0017
Model Year	2010
Native Resolution	800 × 600
Number of Component Outputs	1
Operating System	Windows 10
Personal Computer Design Type	All in One
Power Plug Type	Type C
Processor Brand	no
Processor Count	1
Processor Series	5X86
Processor Socket	no
RAM Memory Technology	no
RAM Type	DDR DRAM
Resolution	800 x 600
Screen Size	2 inches
Speaker Type	External
Specific Uses For Product	Education
Specification Met	[Inferred: Some specifications met]
Style Name	Minimalist
Total Expansion Slots Quantity	20
Total Usb Ports	1
Unit Count	1 Count
Video Output	USB (with adapter)
Video Output Interface	USB (with adapter)
Video Processor	via
Wireless Compability	Infrared
Wireless Technology	Infrared

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$22.03

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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KEYESTUDIO UNO R3用 V4.0開発ボード

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